/* 
 * Serposcope - SEO rank checker https://serposcope.serphacker.com/
 * 
 * Copyright (c) 2016 SERP Hacker
 * @author Pierre Nogues <support@serphacker.com>
 * @license https://opensource.org/licenses/MIT MIT License
 */
package com.serphacker.serposcope.scraper.captcha.solver;

import com.jayway.jsonpath.Configuration;
import com.jayway.jsonpath.DocumentContext;
import com.jayway.jsonpath.JsonPath;
import com.jayway.jsonpath.Option;
import com.serphacker.serposcope.scraper.captcha.Captcha;
import static com.serphacker.serposcope.scraper.captcha.Captcha.Error.EXCEPTION;
import com.serphacker.serposcope.scraper.captcha.CaptchaImage;
import com.serphacker.serposcope.scraper.captcha.CaptchaRecaptcha;
import com.serphacker.serposcope.scraper.http.ScrapClient;
import com.sun.org.apache.xerces.internal.impl.dv.util.Base64;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
import java.util.concurrent.atomic.AtomicInteger;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class AntiCaptchaSolver implements CaptchaSolver {

    final static int SOFT_ID = 836;

    final static Logger LOG = LoggerFactory.getLogger(AntiCaptchaSolver.class);

    final static Configuration JSONPATH_CONF = Configuration.defaultConfiguration()
        .addOptions(Option.DEFAULT_PATH_LEAF_TO_NULL)
        .addOptions(Option.SUPPRESS_EXCEPTIONS);

    public final static long POLLING_PAUSE_MS = 2500l;
    public final static long DEFAULT_TIMEOUT_MS = 180000l;

    private String apiUrl = "http://anti-captcha.com/";
    private String apiUrlv2 = "https://api.anti-captcha.com/";
    private String apiKey;
    private long timeoutMS;
    private int maxRetryOnOverload;
    Random random = new Random();

    AtomicInteger captchaCount = new AtomicInteger();

    public AntiCaptchaSolver(String apiKey) {
        this(apiKey, DEFAULT_TIMEOUT_MS);
    }

    public AntiCaptchaSolver(String apiKey, long timeoutMS) {
        this(apiKey, timeoutMS, 5);
    }

    public AntiCaptchaSolver(String apiKey, long timeoutMS, int maxRetryOnOverload) {
        this.apiKey = apiKey;
        this.timeoutMS = timeoutMS;
        this.maxRetryOnOverload = maxRetryOnOverload;
    }

    public long getTimeoutMS() {
        return timeoutMS;
    }

    public void setTimeoutMS(long timeoutMS) {
        this.timeoutMS = timeoutMS;
    }

    public int getMaxRetryOnError() {
        return maxRetryOnOverload;
    }

    public void setMaxRetryOnError(int maxRetryOnError) {
        this.maxRetryOnOverload = maxRetryOnError;
    }

    public String getApiUrl() {
        return apiUrl;
    }

    public void setApiUrl(String apiUrl) {
        this.apiUrl = apiUrl;
    }

    public String getApiKey() {
        return apiKey;
    }

    public void setApiKey(String apiKey) {
        this.apiKey = apiKey;
    }

    @Override
    public boolean solve(Captcha captcha) {
        if (!(captcha instanceof CaptchaImage || captcha instanceof CaptchaRecaptcha)) {
            return false;
        }

        captchaCount.incrementAndGet();

        captcha.setLastSolver(this);
        captcha.setStatus(Captcha.Status.CREATED);

        Map<String, Object> taskMap = new HashMap<>();
        Map<String, Object> createTaskMap = new HashMap<>();
        createTaskMap.put("clientKey", apiKey);
        createTaskMap.put("softId", "" + SOFT_ID);
        createTaskMap.put("languagePool", "en");
        createTaskMap.put("task", taskMap);

        if (captcha instanceof CaptchaRecaptcha) {
            taskMap.put("type", "NoCaptchaTaskProxyless");
            taskMap.put("websiteURL", ((CaptchaRecaptcha) captcha).getUrl());
            taskMap.put("websiteKey", ((CaptchaRecaptcha) captcha).getChallenge());
        }

        if (captcha instanceof CaptchaImage) {
            taskMap.put("type", "ImageToTextTask");
            taskMap.put("body", Base64.encode(((CaptchaImage) captcha).getImage()));
            taskMap.put("phrase", false);
            taskMap.put("case", false);
            taskMap.put("numeric", 0);
            taskMap.put("math", false);
            taskMap.put("minLength", 0);
            taskMap.put("maxLength", 0);
        }

        long started = System.currentTimeMillis();
        captcha.setStatus(Captcha.Status.SUBMITTED);
        try (ScrapClient http = new ScrapClient()) {
//            http.setInsecureSSL(true);
//            http.setProxy(new HttpProxy("127.0.0.1", 8080));
            String response;
            int retry = 0;
            while (true) {
                http.post(apiUrlv2 + "/createTask", createTaskMap, ScrapClient.PostType.JSON);
                response = http.getContentAsString();
                if (!isRetryable(response)) {
                    break;
                }

                if (++retry > maxRetryOnOverload) {
                    break;
                }

                try {
                    Long sleep = 5000l * retry;
                    LOG.debug("server is overloaded \"{}\", sleeping {} ms", response, sleep);
                    Thread.sleep(sleep);
                } catch (InterruptedException ex) {
                    break;
                }
            }

            if (response == null) {
                captcha.setError(Captcha.Error.NETWORK_ERROR);
                return false;
            }

            Integer errorId = 0;
            DocumentContext doc = null;

            try {
                doc = JsonPath.using(JSONPATH_CONF).parse(response);
                errorId = doc.read("$.errorId");
            } catch (Exception ex) {
                captcha.setError(Captcha.Error.NETWORK_ERROR);
                return false;
            }

            switch (errorId) {
                case 0:
                    break;
                case 1:
                    captcha.setError(Captcha.Error.INVALID_CREDENTIALS);
                    return false;

                case 2:
                    captcha.setError(Captcha.Error.SERVICE_OVERLOADED);
                    return false;

                case 10:
                    captcha.setError(Captcha.Error.OUT_OF_CREDITS);
                    return false;

                default:
                    captcha.setError(Captcha.Error.NETWORK_ERROR);
                    return false;
            }

            Integer taskId = doc.read("$.taskId");
            if (taskId == null) {
                LOG.debug("no taskId");
                captcha.setError(Captcha.Error.NETWORK_ERROR);
                return false;
            }

            captcha.setId(taskId.toString());

            Map<String, Object> getTaskResultMap = new HashMap<>();
            getTaskResultMap.put("clientKey", apiKey);
            getTaskResultMap.put("taskId", taskId);

            long timeLimit = System.currentTimeMillis() + timeoutMS;
            while (System.currentTimeMillis() < timeLimit) {

                http.post(apiUrlv2 + "/getTaskResult", getTaskResultMap, ScrapClient.PostType.JSON);

                String res = http.getContentAsString();
                if (res == null) {
                    captcha.setError(Captcha.Error.NETWORK_ERROR);
                    return false;
                }

                DocumentContext jsonResult = JsonPath.using(JSONPATH_CONF).parse(res);

                String status = jsonResult.read("$.status");
                if ("ready".equals(status)) {

                    if (captcha instanceof CaptchaRecaptcha) {
                        String recaptchaResponse = jsonResult.read("$.solution.gRecaptchaResponse");
                        if (recaptchaResponse == null || recaptchaResponse.isEmpty()) {
                            captcha.setError(Captcha.Error.NETWORK_ERROR);
                            captcha.setStatus(Captcha.Status.ERROR);
                            return false;
                        }

                        ((CaptchaRecaptcha) captcha).setResponse(recaptchaResponse);
                        captcha.setStatus(Captcha.Status.SOLVED);
                        return true;
                    }

                    if (captcha instanceof CaptchaImage) {
                        String textResponse = jsonResult.read("$.solution.text");
                        if (textResponse == null || textResponse.isEmpty()) {
                            captcha.setError(Captcha.Error.NETWORK_ERROR);
                            captcha.setStatus(Captcha.Status.ERROR);
                            return false;
                        }

                        ((CaptchaImage) captcha).setResponse(textResponse);
                        captcha.setStatus(Captcha.Status.SOLVED);
                        return true;
                    }

                }

                Integer errId = jsonResult.read("$.errorId");
                if (errId != null && errId != 0) {
                    captcha.setError(Captcha.Error.NETWORK_ERROR);
                    captcha.setStatus(Captcha.Status.ERROR);
                    return false;
                }

                try {
                    Thread.sleep(POLLING_PAUSE_MS);
                } catch (InterruptedException ex) {
                    break;
                }
            }

            captcha.setError(Captcha.Error.TIMEOUT);
            captcha.setStatus(Captcha.Status.ERROR);

        } catch (IOException ex) {
            LOG.error("io exception", ex);
            captcha.setError(EXCEPTION);
        } finally {
            captcha.setSolveDuration(System.currentTimeMillis() - started);
        }

        return false;
    }

    public boolean isRetryable(String response) {
        boolean retryable = response == null || response.toUpperCase().contains("ERROR_NO_SLOT_AVAILABLE");
//        LOG.debug("isRetryable ? {} - {}", retryable, response);
        return retryable;
    }

    @Override
    public boolean reportIncorrect(Captcha captcha) {
        return false;
    }

    @Override
    public String getFriendlyName() {
        return "anticaptcha";
    }

    @Override
    public boolean testLogin() {
        String balance = getRawBalance();
        if (balance == null || balance.isEmpty()) {
            return false;
        }
        try {
            Float.parseFloat(getRawBalance());
            return true;
        } catch (Exception ex) {
        }
        return false;
    }

    @Override
    public float getCredit() {
        try {
            return Float.parseFloat(getRawBalance());
        } catch (Exception ex) {
            return 0;
        }
    }

    protected String getRawBalance() {
        try (ScrapClient cli = new ScrapClient()) {
            int status = cli.get(apiUrl + "/res.php?key=" + apiKey + "&action=getbalance");
            if (status != 200) {
                return "";
            }
            return cli.getContentAsString();
        } catch (Exception ex) {
            LOG.error("exception", ex);
        }
        return "";
    }

    @Override
    public boolean hasCredit() {
        return getCredit() > 0.001f;

    }

    @Override
    public void close() throws IOException {
    }

    protected Map<String, String> parseAnswer(String answer) {
        Map<String, String> data = new HashMap<>();
        if (answer == null) {
            return data;
        }
        String[] pairs = answer.split("&");
        for (String pair : pairs) {
            String[] keyvalue = pair.split("=");
            if (keyvalue.length == 1) {
                data.put(keyvalue[0], "");
            } else if (keyvalue.length == 2) {
                data.put(keyvalue[0], keyvalue[1]);
            }
        }
        return data;
    }

    public static boolean isValidImageExtension(String ext) {
        if (ext.equalsIgnoreCase("jpg")
            || ext.equalsIgnoreCase("gif")
            || ext.equalsIgnoreCase("jpeg")
            || ext.equalsIgnoreCase("png")) {
            return true;
        }
        return false;
    }

    @Override
    public boolean init() {
        return true;
    }

    @Override
    public int getCaptchaCount() {
        return captchaCount.get();
    }

    @Override
    public void resetCaptchaCount() {
        captchaCount.set(0);
    }

}
